Move a bunch of content\common code into the content namespace.

content/renderer/paint_aggregator.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/paint_aggregator.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 
+namespace content {
+
 // ----------------------------------------------------------------------------
 // ALGORITHM NOTES
 //
 // We attempt to maintain a scroll rect in the presence of invalidations that
 // are contained within the scroll rect.  If an invalidation crosses a scroll
 // rect, then we just treat the scroll rect as an invalidation rect.
 //
 // For invalidations performed prior to scrolling and contained within the
 // scroll rect, we offset the invalidation rects to account for the fact that
 // the consumer will perform scrolling before painting.
@@ skipping 254 matching lines @@
         inner = inner.Union(existing_rect);
       } else {
         outer = outer.Union(existing_rect);
       }
     }
     update_.paint_rects.clear();
     update_.paint_rects.push_back(inner);
     update_.paint_rects.push_back(outer);
   }
 }
+
+}  // namespace content